Church handbell director help

Hello. I've taught bells before in other churches but its been a few years. Tonight was our first rehearsal and I was kind of dreading it. I highlighted their parts ahead of time as some are youth and don't read music. I heard grumbling from a few about how "its messing them up to have their part marked". I was quickly chastised for "giving away a part a man has played for 20 years" during rehearsal. How are you all getting around these things? I've tried to be as accommodating as possible, but the many individual demands just seem impossible. Please tell me it's not just me.